Q:

Select the option that is related to the fifth alphanumeric-cluster in the same way as the second alphanumeric-cluster is related to the first alphanumeric-cluster and the fourth alphanumeric-cluster is related to the third alphanumeric-cluster.
 WXY72 : ZAB29 :: CDE12 : FGH21 :: IJK30 : ? 

• 1
  MNO39
• 2
  MNO40
• 3
  LMN29
• 4
  LMN39